wrote in message
oups.com...
I have an older Evinrude 70hp(90 model, I believe)
But my problem is the overheat alarm seems to sound frequently. But if
you shut the motor off for just a few minutes it shuts off. Then you
can run it for another while longer before it does it again. But in
now is occuring more frequently than it was before. I just had a new
water pump put in at the beginning of the season and new temp sensor
and sending unit last year.

I am thinking I need a new thermostat, but would like some advice on
what to check and do.


Definitely replace the thermostat and make sure there is no salt,sand, or
debris buildup in the cavity.

There were a number of service bulletins about overheating back in those
days that concerned your motor. IF you engine does not have the water
tell-tale (****er) fitting on the top of the block, see a dealer and have
them check the bulletins about relocating the fitting from the port side of
the motor to the top of the block to help in bleeding off trapped air in the
cooling system. Some motors even needed a different temp switch installed.

Bill Grannis
service manager